Home / 21,012.96-28,999.92-15,698.55

Finding the Fourth Proportional to 21,012.96, 28,999.92 and 15,698.55

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Solution

The fourth proportional to 21,012.96, 28,999.92 and 15,698.55 is: 21,665.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,012.96 : 28,999.92 = 15,698.55 : x
  2. Step 2: Convert to fraction form
    21,012.96/28,999.92 = 15,698.55/x
  3. Step 3: Cross multiply
    21,012.96x = 28,999.92 × 15,698.55
  4. Step 4: Simplify right side
    21,012.96x = 455,256,694.12
  5. Step 5: Solve for x
    x = 455,256,694.12/21,012.96
  6. Step 6: Final answer
    x = 21,665.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.